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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES Part 2 (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) reclassified from AOCI to income | $ (302) |  | $ 8,397 |  | $ (1,861) |
Ineffective portion of gain (loss) on derivatives recognized in income | (786) |  | (124) |  | (344) |
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) reclassified from AOCI to income | (513) |  | 8,397 |  | (2,327) |
Ineffective portion of gain (loss) on derivatives recognized in income | (659) |  | (299) |  | (356) |
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) recognized in OCI on derivatives | 4,923 |  | 4,505 |  | 5,226 |
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Revenue [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) reclassified from AOCI to income | (4) |  | 18,929 |  | 7,443 |
Ineffective portion of gain (loss) on derivatives recognized in income | (420) |  | (36) |  | 966 |
Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Expenses [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) reclassified from AOCI to income | (509) |  | (10,532) |  | (9,770) |
Ineffective portion of gain (loss) on derivatives recognized in income | (239) |  | (263) |  | (1,322) |
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) recognized in OCI on derivatives | 5,046 |  | 4,802 |  | 5,581 |
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) recognized in OCI on derivatives | 123 |  | 297 |  | 355 |
Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Regulated Gas Distribution Other Operation Expenses [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |
Derivatives in Cash Flow Hedging Relationships [Abstract] |  |  |  |  |  |
Effective portion of gain (loss) reclassified from AOCI to income | 211 |  | 0 |  | 466 |
Ineffective portion of gain (loss) on derivatives recognized in income | (127) |  | 175 |  | 12 |
Not Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Revenue [Member] |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments [Abstract] |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | (778) | [1] | (615) | [1] | (115) | [1]
Not Designated as Hedging Instrument [Member] | NYMEX Natural Gas Contracts [Member] | Non-Regulated Gas Marketing Operating Expenses [Member] |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments [Abstract] |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | 0 | [1] | (625) | [1] | (3) | [1]
Not Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments [Abstract] |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | (815) | [1] | 3,248 | [1] | 3,488 | [1]
Not Designated as Hedging Instrument [Member] | NYMEX Gasoline and Heating Oil Contracts [Member] | Other Income and (Income Deduction) - Net [Member] |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments [Abstract] |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | 41 | [1] | 19 | [1] | 37 | [1]
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Non-Regulated Gas Marketing Operating Revenue [Member] |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments [Abstract] |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | (78) | [1] | 3,782 | [1] | (660) | [1]
Not Designated as Hedging Instrument [Member] | Natural Gas Commodity Contracts [Member] | Non-Regulated Gas Marketing Operating Expenses [Member] |  |  |  |  |  |
Derivatives Not Designated as Hedging Instruments [Abstract] |  |  |  |  |  |
Gain (loss) recognized in income on derivatives | $ 0 | [1] | $ 687 | [1] | $ 4,229 | [1]
[1] | Gains and losses on the Utility’s natural gas derivative instruments, which are not designated as hedging instruments for financial reporting purposes, are deferred pursuant to the Utility’s PGA Clause and initially recorded as regulatory assets or regulatory liabilities. These gains and losses are excluded from the table above because they have no direct impact on the Statements of Consolidated Income. Such amounts are recognized in the Statements of Consolidated Income as a component of Regulated Gas Distribution Natural and Propane Gas operating expenses when they are recovered through the PGA Clause and reflected in customer billings.

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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